Well, I'll be a monkey's uncle (via Peter Batty):
Clemens gave an excellent and very frank talk on "The gap between SDIs and the GeoWeb". A couple of quotes that I noted were "So far the impact of SDIs on the integration of data as a ubiquitous component of the web seems low" and "There is not evidence that SDIs have increased the market volume of government data by a significant amount". He noted that OGC web services are based largely on an architecture and approach to web services developed around 10 years ago, well before many recent web innovations.
The WxS specifications began coming out 10 years ago, but the OGC's approach certainly predates the web.
At the 2007 FOSS4G conference, Charlie Savage (not, I think, intentionally invoking Ziggy Stardust) gave the OGC's WxS architecture 5 years. It seemed ridiculous then to say even what now appears, coming from Clemens, to be conventional wisdom. What will 3 more years bring?